When using the Windows NT Zero-Administration-Kit (ZAK), you can choose to hide certain drives. However, by default, the drives suggested aren't a lot of use (certainly not for Metaframe users). So here is a useful little utility to let you hide whichever drives you want.

Tick the boxes corresponding to the drives you wish to display and then click calculate.

NoDrives=67108863

ABCDEFGHIJKLM
NOPQRSTUVWXYZ

Can I have that as a takeaway please?

Sure, click here for a BBC Basic version. Load onto your Acorn and set the file type to BASIC (FFB)

What do I do with the number?

Edit zakwinnt.adm and look for the following lines which refer to the drives that are hidden: 
	KEYNAME Software\Microsoft\Windows\CurrentVersion\Policies\Explorer

		PART !!HideDrivesOptions	DROPDOWNLIST
		VALUENAME "NoDrives"		
		ITEMLIST
			Name !!HideDrives_all	VALUE NUMERIC 67108863
			NAME !!HideDrives_C	VALUE NUMERIC 67108859 ; (67108863 - 4)
			NAME !!HideDrives_U	VALUE NUMERIC 66060287 
			NAME !!HideDrives_CU	VALUE NUMERIC 66060283
			NAME !!HideDrives_COU	VALUE NUMERIC 66043899
			NAME !!HideDrives_W	VALUE NUMERIC 62914559  ;added by me
			NAME !!HideDrives_WC	VALUE NUMERIC 62914555  ;added by me
Edit the !!HideDrives_ lines to correspond to the drives to wish to display using the number calculated. For examples, if you wish to display S:, U: and W: edit a line to read: 
			NAME !!HideDrives_SUW	VALUE NUMERIC 61603839
Then go down the file a little further and look for the lines that look like this: 
HideDrivesOptions="Choose Drives that will be shown:"
HideDrives_all="Don't show any drives"
HideDrives_C="Only C:"
HideDrives_U="Only U:"
HideDrives_W="Only W:"
HideDrives_WC="Show ONLY W: and C:"
HideDrives_CU="Both C: and U:"
HideDrives_COU="Both C: O: and U:"
These lines give textual messages for the lines in the previous sections. Edit or create a line corresponding to the drives you wish to display, e.g. in our example this would be: 
HideDrives_SUW="Show S:, U: and W:"
(Just because the folks at Microsoft can't spell, have exceeding poor grammar and are willing to release things to the public without proof-reading doesn't mean you need to follow suit.)